`SpatialDispersion` estimator + more general pixel finding interface

[kahaaga]

This is a new version of #126.

[codecov[bot]]

Codecov Report

Merging #203 (d0914f0) into main (3396f27) will decrease coverage by 0.71%. The diff coverage is 82.56%.

@@            Coverage Diff             @@
##             main     #203      +/-   ##
==========================================
- Coverage   85.20%   84.49%   -0.72%     
==========================================
  Files          47       49       +2     
  Lines        1122     1193      +71     
==========================================
+ Hits          956     1008      +52     
- Misses        166      185      +19     

Impacted Files	Coverage Δ
.../spatial_permutation/SpatialSymbolicPermutation.jl	68.29% <71.87%> (ø)
...rs/spatial/spatial_dispersion/SpatialDispersion.jl	80.95% <80.95%> (ø)
src/probabilities_estimators/spatial/utils.jl	94.11% <94.11%> (ø)
src/entropies/convenience_definitions.jl	100.00% <100.00%> (ø)

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